Just wrote this following a conversation trying to remember an actor's name. Seems likely to have been done before, but I don't see it elsewhere from a quick search.
Gangster
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Int. Film Set.
1930S AMERICAN 'GANGSTERS' IN A PRIVATE BAR. A GANGSTER (TALL, HEAVY-RIMMED GLASSES, NERDY LOOKING) IS FIRING HIS GUN INTO THE FLOOR IN FRONT OF A TERRIFIED YOUNG MAN.
Gangster:
(Very high-pitched, very squeaky voice) You think you can come here and disrespect my family. Dance, you motherf**ker.
THE YOUNG MAN 'DANCES' AS THE BULLETS NEARLY HIT HIS FEET.
PAN TO SHOW THE DIRECTOR OF THE FILM SITTING IN HIS CHAIR.
Director:
(Shouting furiously) Cut! Get me Casting. I asked for Joe PESCI.